| [GMCnet] Sound proof your engine [message #237364] |
Fri, 24 January 2014 21:32  |
glwgmc
Messages: 1014
Registered: June 2004
Karma:
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Senior Member |
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I used the Silent Running that Armand pointed out (Chuck Botts original post) on the underside of the deck in our Royale. It works and we did experience a drop in engine noise. However, when we put in the new S & J engine we did not have a real HEI air cleaner. The previous air cleaner was cobbled to make it sorta fit the HEI requirement. For break-in we purchased an aftermarket chrome open-all-the-way around air cleaner and a stub in the hole breather "filter". We heard a lot of noise from those. At the Coos Bay rally we purchased a real HEI air cleaner from John Ruff and that made a significant difference in noise (thanks John) and gave us back the proper PCV system. That said, we could, and can now, still hear the noise of the headers. Our Clasco has cast iron manifolds and it is lots quieter. At our sub-3000 RPM range I doubt if there is any difference in performance, but we hear a significant difference in noise level between the two. I am thinking that this a
dditional sound proofing layer will be beneficial.
What I really like is the fact that they offer a ceiling panel product, a rug/snap floor underlayment product, and a wall/roof insulation product that combined look to me like it would dramatically reduce both the heat and sound issues in a GMC. Time will tell.
Jerry
Jerry Work
The Dovetail Joint
Fine furniture designed and hand crafted in the 1907 former Masonic Temple building in historic Kerby, OR
Visitors always welcome!
glwork@mac.com
http://jerrywork.com
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Jerry & Sharon Work
78 Royale
Kerby, OR
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